KR102320605B1 - gas scrubber - Google Patents

Abstract

A gas scrubber ( 1 ) includes a casing ( 3 ) surrounding a cleaning chamber ( 4 ). The casing comprises a gas inlet 5 into the cleaning chamber and a gas outlet 6 from the cleaning chamber. The gas flow of gas flows in the flow direction F through the cleaning chamber from the gas inlet towards the gas outlet. A deflector device 11 is provided between a gas inlet and a gas outlet in the cleaning chamber and forms a passage 28 between the deflector device and the casing. The spray nozzle 8 is arranged between the gas outlet and the deflector device to spray the cleaning liquid into the cleaning chamber and the gas flow. An inner shield 20 extends between the casing and the deflector device, at least partially surrounds the deflector device 11 , and forms a gap 21 with the casing. The cleaning solution may flow through the gap.

Description

gas scrubber

FIELD OF THE INVENTION The present invention relates generally and in particular to the cleaning of gases, in particular exhaust gases, from engines, burners, boilers and the like in ships. More precisely, the present invention

a casing extending along a central longitudinal axis and surrounding a cleaning chamber; The casing has a gas inlet for a gas to be cleaned, extending into the cleaning chamber, and a gas outlet for the cleaned gas, extending from the cleaning chamber, the casing such that a gas flow of the gas is directed in a flow direction from the gas inlet to the gas outlet. a casing configured to flow through the cleaning chamber;

a deflector device provided between the gas inlet and the gas outlet in the cleaning chamber and defining a passage therebetween, and

A scrubber for gas cleaning, comprising a spray nozzle disposed between a gas outlet of the casing and a deflector device and configured to spray a cleaning liquid into the cleaning chamber and the gas flow.

US 2016/0016109 discloses a vertical scrubber for exhaust gases from marine engines. The exhaust gas tube is disposed substantially coaxially through the bottom of the lower cleaning chamber. The exhaust gas outlet is disposed coaxially through the top of the upper cleaning chamber. A lower cleaning chamber deflector is disposed over the opening of the exhaust gas tube to redirect the exhaust gas towards the wall of the scrubber and create a turbulent gas flow. A lower chamber water injector is disposed above the lower cleaning chamber deflector to introduce scrubbing water. The lower chamber exhaust gas outlet is disposed at the top of the lower cleaning chamber as a coaxial abutment for withdrawing the partially cleaned exhaust gas from the first cleaning chamber and introducing the gas into the upper cleaning chamber.

For example, when operating a scrubber or wet scrubber to clean exhaust gases from a marine engine, cleaning liquid is sprayed into a cleaning chamber, which may include one or more cleaning sections, which react with the exhaust gases to release sulfur, soot and particles. remove the same contaminants. In the case of an in-line scrubber, such as the scrubber described above, at least one deflector device is provided in the cleaning chamber to ensure that the cleaning liquid does not flow into the exhaust gas line of the marine engine. One such deflector device is typically positioned over the exhaust gas pipe and can function as a cover. In order to minimize the overall footprint of the scrubber, the available area through which the exhaust gas passes is limited, so that the gas velocity can increase as it passes through the deflector device. High gas velocities make it difficult to drain the cleaning liquid from the scrubber, since the cleaning liquid must normally pass through the same area in the opposite direction to be discharged, ie through the exhaust gas flow. The effect may result in higher levels of cleaning liquid being incorporated in the same or next cleaning section within the scrubber.

During operation of a scrubber having one stage, ie, one cleaning section, cleaning liquid may be entrained at a location higher or further downstream in the scrubber due to the high exhaust gas velocity and reduced discharge capacity. Incorporation of the cleaning solution can have several disadvantages during operation of the scrubber. Incorporation of cleaning liquid can increase cleaning liquid retention in the scrubber. Incorporation of the cleaning solution can greatly increase the back pressure. Incorporation of the cleaning liquid can reduce the ability to drain the cleaning liquid from the cleaning chamber. The incorporation of the scrubbing solution can increase the risk of sulfur release at levels more downstream of the scrubber, caused by an increase in the amount of scrubbing solution that has absorbed sulfur. The incorporation of the cleaning solution can reduce the scrubber's ability to ensure backflow, reducing overall scrubber performance.

During operation of a scrubber having two or more stages, i.e., having an upstream cleaning section and a downstream cleaning section, the high exhaust gas velocity and reduced discharge capacity allow cleaning liquid to be entrained from the upstream cleaning section to the downstream cleaning section. Also, in this case, the entrainment of the cleaning liquid may have some disadvantages during operation of the scrubber. Incorporation of the rinse liquid can increase cleaning liquid retention in the upstream cleaning section. Incorporation of the cleaning solution can greatly increase the back pressure. Incorporation of the cleaning liquid can reduce the ability to drain the cleaning liquid from the upstream cleaning section. Incorporation of the cleaning liquid can “contaminate” the cleaning process and cleaning liquid with soot and particles in the downstream cleaning section. Incorporation of the rinse liquid can reduce the likelihood of washing the entire rinse liquid because the amount of "contaminated" cleaning liquid may be much greater in the downstream section than in the upstream section. Incorporation of the scrubbing liquid may require a higher discharge capacity in the downstream scrubbing section. Incorporation of the scrubbing solution can increase the risk of sulfur release in the downstream section, caused by an increase in the amount of scrubbing solution that has absorbed sulfur. Incorporation of the rinse liquid may reduce the ability to use the reflux system to circulate the drained cleaning liquid from the downstream section to the upstream section as described in EP 2775112.

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the aforementioned problems. More precisely, it is an object of the present invention to reduce entrainment of the cleaning liquid in the scrubber.

This object is achieved by a scrubber as defined at the outset, which is characterized in that it comprises an inner shield extending between the casing and the deflector device and at least partially surrounding the deflector device. The inner shield defines a gap with the casing, the gap having an inlet end and an outlet end to allow a downward flow of cleaning liquid through the gap, past the inner shield and along the casing.

Accordingly, the scrubber includes an inner shield extending inside the casing and out of the deflector device. The inner shield separates a gap between the inner shield and the casing from the passage, the gap having an inlet end and an outlet end. The inner shield is configured to allow flow of the cleaning solution through the gap.

During operation of the scrubber, droplets of cleaning liquid will hit the deflector device. Thus, the cleaning liquid is collected on the deflector device. This cleaning liquid has to be discharged from the scrubber, typically at a location upstream of the deflector device, ie between the gas inlet and the deflector device. Such evacuation may require cleaning liquid flow in the opposite direction to the gas flow direction in the casing. In the passage between the casing and the deflector device, especially in the narrowest part of this passage, the flow rate of the gas from the gas inlet to the gas outlet is determined at a distance from the inner surface of the casing, i.e. closer to the deflector device than to the inner surface of the casing. It may be close to, or lower on its inner surface. High gas flow rates can impede the opposite rinse liquid flow and thus rinse liquid discharge, and may even force the cleaning liquid in the direction of the gas flow.

The inner shield may protect or shield the cleaning liquid flowing along the inner surface of the casing from the gas flowing at a high velocity in the flow direction in the passage. The inner shield may prevent gas from contacting the cleaning liquid in the gap and may prevent the cleaning liquid from entraining into the gas flow towards the gas outlet. Accordingly, entrainment of the cleaning liquid from the passage as well as cleaning liquid stagnation and back pressure can be reduced.

According to an embodiment of the present invention, the longitudinal central axis may be perpendicular or slightly inclined with respect to the vertical direction.

According to an embodiment of the present invention, the gas inlet may be disposed below the gas outlet. The gas inlet and gas outlet may or may not be arranged concentrically.

According to an embodiment of the present invention, the inlet end of the gap is open toward the gas outlet, the outlet end of the gap is open toward the gas inlet, and the flow of cleaning liquid is allowed from the inlet end to the outlet end in a direction opposite to the flow direction. do. Thus, the cleaning liquid can flow in an unobstructed manner through the gap towards the liquid discharge means in a direction opposite to the flow direction.

According to an embodiment of the present invention, the inner shield extends around the deflector device to provide an annular extension in the gap between the inner shield and the casing. The annular extension is advantageous where a small footprint is desired. Moreover, smooth flow through the cleaning chamber can be ensured by the annular extension.

According to an embodiment of the present invention, the casing and the inner shield have cross-sections that are at least partially of the same shape, but not necessarily of the same size. Accordingly, the gap between the casing and the inner shield can have a uniform thickness in the cross-sectional plane.

According to an embodiment of the present invention, the inner shield comprises an inclined shield portion. The inclined shielding portion is inclined inwardly toward the longitudinal central axis to gradually widen the gap in a direction from the outlet end of the gap toward the inlet end. This means that the gap tapers in the opposite direction. The inclined shield portion may define an inlet end of the gap or may be an intermediate portion of the inner shield. The inclined shielding portion may facilitate entry and guidance of the cleaning liquid into the gap.

According to an embodiment of the present invention, the inner shield comprises an axial shield portion extending axially with the casing from the oblique shield portion toward the outlet end of the gap. Accordingly, the axial shielding portion may extend parallel to the casing.

According to an embodiment of the invention, the scrubber comprises a flow prevention element which extends inwardly from the casing into the gap, whether perpendicular to the inner surface of the casing or not, and is arranged to force the cleaning liquid towards the inner shield. The flow prevention element can direct the cleaning liquid flowing along the inner surface of the casing to the inner shield, thereby ensuring flow of the cleaning liquid on the outer surface of the inner shield facing the gap. The gas flowing through the cleaning chamber may be hot or very hot, and the flow of cleaning liquid on the outer surface of the inner shield may ensure cooling of the inner shield. Thus, the flow prevention element can prevent droplets of the cleaning liquid on the outer surface of the inner shield. Such droplets can evaporate immediately, leaving deposits such as salts on the outer surface of the inner shield, which deposits can limit and eventually clog the gap.

According to an embodiment of the present invention, the scrubber comprises a flow prevention element extending inwardly from the casing into a gap, whether perpendicular to the inner surface of the casing or not and arranged to force the cleaning liquid towards the inner shield, the flow prevention element comprising: It is provided opposite to the inclined shielding portion. Thus, the flow of the cleaning liquid on the outer surface of the inner shield can be ensured from the inlet end to the outlet end, ie along the entire axial length of the inner shield.

According to an embodiment of the present invention, the flow prevention element extends at a distance from the inner shield.

According to an embodiment of the invention, the inner shield, and thus the gap, has an axial length and a transverse length perpendicular to the axial length. The transverse length is thus perpendicular to the longitudinal central axis and extends circumferentially within the casing. The flow prevention element may extend along some or all of the transverse length of the inner shield and gap.

According to an embodiment of the present invention, a deflector device comprises an upstream surface facing a gas inlet and having an outer edge coincident with an upstream transverse plane, and a downstream surface facing toward the gas outlet and having an outer edge coincident with a downstream transverse plane. . The upstream and downstream transverse planes may be displaced or coincident with respect to each other. The upstream surface of the deflector device is the surface viewed from the gas inlet and may be formed by one and the same or more than one component. Similarly, the downstream surface of the deflector device is the surface viewed from the gas outlet and may be formed by one and the same or more than one component.

According to an embodiment of the present invention, the upstream surface tapers towards the gas inlet. Such an upstream surface may guide gas flowing through the cleaning chamber outwardly into a passageway. The passageway may form a restriction of the flow area of the cleaning chamber, so that the gas velocity in the passageway will increase.

According to an embodiment of the invention, the outlet end of the gap is located axially closer to the gas inlet than in the upstream transverse plane. Accordingly, the inner shield can be located at the level of a passage where the gas velocity is relatively high and the demand for cleaning fluid flow shielding is relatively high.

According to an embodiment of the invention, the inlet end of the gap is located axially closer to the gas outlet than the downstream transverse plane. Accordingly, the inner shield can be located at the level of a passage where the gas velocity is relatively high and the demand for cleaning fluid flow shielding is relatively high.

According to an embodiment of the invention, the injection nozzle is located axially closer to the gas outlet than the inlet end of the gap. The spray angle of the spray nozzle is typically 60 to 180 degrees. Accordingly, this embodiment makes it possible for the cleaning liquid sprayed from the spray nozzle to enter the gap.

According to an embodiment of the present invention, the scrubber includes at least one transfer member extending from the deflector device and configured to guide the cleaning liquid from the deflector device to facilitate discharge of the cleaning liquid from the scrubber. The at least one transfer member may extend towards the liquid discharge means of the scrubber.

According to an embodiment of the invention, the scrubber comprises at least one conveying member extending from the deflector device towards the casing, the at least one conveying member to guide the cleaning liquid from the deflector device towards the casing, in particular to the inner surface of the casing. is composed Thus, the cleaning liquid reaching the deflector device can be conveyed towards the casing, in particular to the inner surface of the casing to form a flow of the cleaning liquid to the liquid discharge means, thereby further reducing entrainment of the cleaning liquid by the gas flow.

According to an embodiment of the invention, the inner shield includes at least one opening extending from the inside to the outside of the inner shield and communicating with the at least one transfer member to allow supply of cleaning liquid from the deflector device to the gap. The transfer member or transfer members may deliver the cleaning liquid directly into the gap except for any contact between the gas and the cleaning liquid.

According to an embodiment of the present invention, the passage between the deflector device and the casing has a variable width and the inner shield extends through the narrowest portion of the passage. This allows for optimal positioning and extension of the inner shield, as the gas velocity, and hence the need for cleaning fluid shielding, is typically greatest in the narrowest portion of the passageway.

According to an embodiment of the present invention, the scrubber comprises a restricting element extending inwardly from the casing towards the gas outlet, the restricting element forming a tray between the restricting element and the casing, the tray being configured to collect the cleaning liquid.

According to an embodiment of the invention, a limiting element is provided downstream of the deflector device and downstream of the inner shield.

According to an embodiment of the invention, the scrubber comprises an upstream cleaning section adjacent to the gas inlet in which the deflector device is arranged as an upstream deflector device, and a downstream cleaning section adjacent to the gas outlet in which a further deflector device is disposed as a downstream deflector device. includes An inner shield may be provided in the upstream cleaning section at an axial level of the upstream deflector device.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will now be described in more detail through the description of various embodiments and with reference to the accompanying drawings.
1 schematically discloses a longitudinal section of a scrubber according to a first embodiment of the present invention.
FIG. 2 schematically discloses a longitudinal section of a part of the scrubber of FIG. 1 .
3 schematically discloses a longitudinal section of the inner shield of the scrubber of FIG. 1 ;
FIG. 4 schematically discloses a cross-section along the line IV-IV of FIG. 2 .
FIG. 5 schematically discloses a longitudinal section similar to FIG. 3 but of an inner shield of a scrubber according to a second embodiment;
6 schematically discloses a cross-section similar to FIG. 4 of an upstream deflector device according to a third embodiment;

1 discloses an in-line scrubber 1 for cleaning gases such as exhaust gases from engines, burners, boilers, etc., for example from a marine engine 2 schematically shown in FIG. 1 .

The scrubber 1 comprises a casing 3 extending along a central longitudinal axis x and enclosing a cleaning chamber 4 . The longitudinal central axis x may be vertical as shown in FIG. 1 . The scrubber 1 has a first end 1a that can form a lower end, and a second end 1b that can form an upper end.

In the first embodiment, the scrubber 1 and the casing 3 have a circular cross section (see Fig. 4).

The casing 3 comprises a gas inlet 5 for the gas to be cleaned, and a gas outlet 6 for the cleaned gas. A gas inlet 5 is provided at the first end 1a and extends into the cleaning chamber 4 . A gas outlet 6 is provided at the second end 1b and extends from the cleaning chamber 4 .

In the first embodiment, the gas inlet 5 and the gas outlet 6 are concentric with the longitudinal central axis x (see FIG. 1 ).

The casing 3 is configured to allow a gas flow of gas to flow through the cleaning chamber 4 in the flow direction F from the gas inlet 5 to the gas outlet 6 .

The gas inlet 5 comprises an inlet tube 7 connected to the exhaust pipe 2a of the marine engine 2 . An inlet tube 7 extends at a first end 1a into the cleaning chamber 4 (see also FIG. 2 ). The exhaust pipe 2a and the inlet tube 7 may extend in a straight line with the longitudinal central axis x.

The scrubber 1 comprises at least one spray nozzle 8 configured to spray the cleaning liquid into the cleaning chamber 4 and into the gas flow. In the disclosed embodiment, the scrubber 1 comprises a plurality of spray nozzles 8 , for example five spray nozzles 8 as shown in FIG. 1 . The number of spray nozzles 8 can be adjusted to suit the design and size of the scrubber 1 . Each injection nozzle 8 may be directed towards the gas inlet 5 and/or towards the gas outlet 6 (see illustrated orientation in FIG. 1 ).

The scrubber 1 comprises liquid discharge means for discharging the used cleaning liquid from the cleaning chamber 4 . The first liquid outlet 9 of the liquid discharge means is provided outside the gas inlet 5 . In a first embodiment, the first liquid outlet 9 may be annular and, as can be seen in FIGS. 1 and 2 , between the inner surface 10 of the casing 3 and the inlet tube 7 . It may extend around the inlet tube 7 . The spent cleaning liquid flowing along the inner surface 10 of the casing 3 can be discharged through the first liquid outlet 9 .

The scrubber 1 comprises at least one deflector device 11 , 12 provided in the cleaning chamber 4 concentrically with the casing 3 between the gas inlet 5 and the gas outlet 6 . In a first embodiment, two deflector devices 11 , 12 are provided, namely one upstream deflector device 11 and one downstream deflector device 12 .

The injection nozzle 8 is arranged between the gas outlet 6 of the casing 3 and the upstream deflector device 11 .

The upstream deflector device 11 may be provided close to the gas inlet 5 and may serve as a cover preventing the cleaning liquid from entering the gas inlet 5 and the exhaust pipe 2a of the marine engine 2 . . This can be seen in FIGS. 1 and 2 , where the upstream deflector device 11 is provided directly above the inlet tube 7 .

The upstream deflector device 11 can be attached to the inlet tube 7 via suitable attachment bars, schematically shown in dotted lines in FIG. 2 .

The scrubber 1 may comprise a limiting element 13 extending inwardly from the casing 3 towards the gas outlet 6 . The limiting element 13 forms an annular tray 14 between the limiting element 13 and the inner surface 10 of the casing 3 . Tray 14 is configured to collect used cleaning solution. The second liquid outlet 15 of the liquid discharge means extends out of the casing 3 from the tray 14 to allow the used cleaning liquid to be discharged from the cleaning chamber 4 .

The limiting element 13 is provided downstream of the upstream deflector device 11 and upstream of the downstream deflector device 12 , or in other words axially between the upstream deflector device 11 and the downstream deflector device 12 .

The downstream deflector device 12 can be attached to the limiting element 13 via suitable attachment bars, schematically shown in dashed lines in FIG. 2 . Alternatively, the downstream deflector device 12 may be attached to the casing 3 .

In the first embodiment, the scrubber 1 is a two-stage scrubber and includes an upstream cleaning section 4a adjacent to the gas inlet 5 and a downstream cleaning section 4b adjacent to the gas outlet 6 . An upstream deflector device 11 is provided in the upstream cleaning section 4a. A downstream deflector device 12 is provided in the downstream cleaning section 4b.

The limiting element 13 may form a transition from the upstream cleaning section 4a to the downstream cleaning section 4b.

The upstream deflector device 11 and the downstream deflector device 12 comprise respective upstream deflectors 18 having an upstream surface 16 (see FIG. 2 ). The upstream surface 16 may cover the upstream deflector 18 . The upstream surface 16 has an outer edge 16 ′, which may also form the outer edge 16 ′ of the upstream deflector 18 . The upstream surface 16 extends from the upstream lateral plane Pa of each of the upstream and downstream deflector devices 11 , 12 towards the gas inlet 5 (see FIGS. 1 to 3 ). The upstream surface 16 tapers towards the gas inlet 5 from the outer edge 16' located in the upstream transverse plane Pa. In a first embodiment, the upstream surface 16 may be formed in a conical or frusto-conical shape.

The upstream deflector device 11 and the downstream deflector device 12 also include respective downstream deflectors 19 having a downstream surface 17 . The downstream surface 17 may cover the downstream deflector 19 . The downstream surface 17 has an outer edge 17 ′, which may also form the outer edge 17 ′ of the downstream deflector 19 . A downstream surface 17 extends from the respective downstream transverse plane Pb of the upstream and downstream deflector devices 11 , 12 towards the gas outlet 6 (see FIGS. 1 to 3 ). The downstream surface 17 tapers towards the gas outlet 6 from the outer edge 17 ′ located in the downstream transverse plane Pb. In a first embodiment, the downstream surface 17 may be formed in a conical or frusto-conical shape.

The transverse planes Pa, Pb are perpendicular to the longitudinal central axis x.

In the first embodiment, both the upstream deflector device 11 and the downstream deflector device 12 have a circular shape when viewed in the direction of the longitudinal central axis x, and the deflector devices 11 and 12 and the casing 3 are Each annular passageway 28 is formed therebetween (see FIG. 4 ).

The cleaning chamber 4 has a smaller flow area in the passageway 28 than upstream and downstream of the passageway 28 .

The diameter of the downstream deflector device 12 may, but need not be, smaller than the diameter of the upstream deflector device 11 as shown in FIG. 2 .

inner shield (20)

The scrubber 1 comprises an inner shield 20 extending inside the casing 3 and outside the upstream deflector device 11 , ie between the casing 3 and the deflector device 11 . The inner shield 20 is secured to the casing 3 by screws or welding and extends concentrically with the casing along the inner surface 10 of the casing 3 . The inner shield 20 separates a gap 21 between the inner shield 20 and the inner surface 10 of the casing 3 from the passageway 28 (see FIG. 3 ).

Due to the conical shape of the upstream and downstream surfaces 16 , 17 of the deflector device 11 , the passage 28 between the deflector device 11 and the casing 3 has a variable width and the inner shield 20 has It extends through the narrowest portion of the passageway 28 . In the first embodiment, the narrowest part of the passageway 28 is located in the downstream transverse plane Pb and/or in the upstream transverse plane Pa.

The gap 21 has an inlet end 22 open towards the gas outlet 6 , and an outlet end 23 open towards the gas inlet 5 . The inner shield 20 allows the flow of cleaning liquid through the gap 21 from the inlet end 22 to the outlet end 23 along the inner surface 10 of the casing 3 in a direction opposite to the flow direction F. makes it possible

The inner shield 20 extends around the upstream deflector device 11 to provide an annular extension in the gap 21 between the inner shield 20 and the casing 3 .

The casing 3 and the inner shield 20 have an at least partially uniform cross-section. In the first embodiment, both the casing 3 and the inner shield 20 have a circular cross-section.

The passageway 28 has a transverse extension perpendicular to the longitudinal central axis x. The inner shield 20 abuts the passageway 28 along the entire lateral extension of the passageway 28 . The transverse extension of the passageway 28 is perpendicular to the longitudinal central axis x and extends circumferentially inside the casing 3 and the inner shield 20 . In a first embodiment, the transverse extension is 360 degrees around the upstream deflector device 11 .

The inner shield 20 is formed of a sheet material, such as a sheet of metal, and includes a beveled, here conical shield portion 24 . The inclined shielding portion 24 is inclined inwardly toward the longitudinal central axis x to gradually widen the gap 21 in a direction from the outlet end 23 of the gap 21 toward the inlet end 22 .

The oblique shield portion 24 extends from a plane 25 extending perpendicular to the longitudinal central axis x and towards the inlet end 22 between the outlet and inlet ends 23, 22 of the gap 21, Here it is located entirely up to the inlet end.

The plane 25 may be located closer to the inlet end 22 than to the outlet end 23 . Alternatively, the plane 25 may be located closer to the outlet end 23 or even at the outlet end 23 than the inlet end 22 .

In the first embodiment, the inner shield 20 also comprises a straight or axial shield portion 29 extending axially with the casing 3 from the inclined shield portion 24 towards the outlet end 23 . . The axial shielding portion 29 extends from the plane 25 parallel to the longitudinal central axis x and parallel to the casing 3 .

In the first embodiment, the inner shield 20 has a circular cross-section, so that the gap 21 between the casing 3 and the inner shield 20 is as can be seen in FIG. 4 and mentioned above. It is annular as shown. The inner shield 20 has an axial length A along the casing 3 (see FIG. 2 ) and a transverse length T perpendicular to the axial length A. In the first embodiment, the transverse length T of the inner shield 20 is equal to the circumferential length of the inner shield 20 (see FIG. 4 ).

The upstream and downstream deflector devices 11 , 12 each have a height H, which coincides with the longitudinal central axis x and extends from the upstream surface 16 to the downstream surface 17 (see FIG. 2 ). . The height H of the upstream deflector device 11 may be different from the height H of the downstream deflector device 12 . The axial length A of the inner shield 20 may be less than twice the height H of the upstream deflector device 11 .

The gap 21 has a variable width W, ie the distance from the inner surface 10 of the casing 3 to the outer surface 26 of the inner shield 20 (see FIG. 3 ). The width W may be 2-8 mm, preferably 3-5 mm, more preferably 4 mm or about 4 mm at or below the plane 25 , ie outside of the oblique shielding part.

The scrubber 1 comprises a flow prevention element 27 which extends inwardly from the casing 3 into the gap 21 and is welded to the inner surface 10 of the casing. The flow prevention element 27 is arranged to force the cleaning liquid towards the inner shield 20 . As can be seen in FIG. 3 , the flow prevention element 27 is provided opposite the inclined shielding portion 24 , and is inclined shielding at a position away from the inner shield 20 and from the inclined shielding portion 24 . It extends towards the portion 24 . The flow prevention element 27 can extend along the entire transverse length T of the inner shield 20 , ie along the circumference of the inner shield 20 in the first embodiment.

Accordingly, the inner shield 20 is provided in the upstream cleaning section 4a at the axial level of the upstream deflector device 11 . More precisely, the outlet end 23 of the gap 21 is located axially closer to the gas inlet 5 than the upstream transverse plane Pa. Moreover, the inlet end 22 of the gap 21 is located axially closer to the gas outlet 6 than the downstream transverse plane Pb.

Each injection nozzle 8 is located axially closer to the gas outlet 6 than the inlet end 22 of the gap 21 . In particular, the most upstream injection nozzle 8 is located axially closer to the gas outlet 6 than the inlet end 22 of the gap 21 .

transfer member (30)

In a first embodiment, the scrubber 1 comprises at least one transfer member 30 extending from the upstream deflector device 11 towards the casing 3 . The number of transfer members 30 may be one, two, three, four or more. In the first embodiment, three conveying members 30 are provided (see FIG. 4 ). The three transfer members 30 may be provided equidistant around the upstream deflector device 11 .

The transfer member 30 is configured to guide the cleaning liquid collected by the upstream deflector device 11 from the upstream deflector device 11 toward the casing 3 .

Each of the transfer members 30 extends along a portion of the imaginary straight line L. In the first embodiment, an imaginary straight line L extends from the longitudinal central axis x to the casing 3 (see FIG. 4 ). Thus, in the first embodiment, each conveying member 30 extends radially outward with respect to the longitudinal central axis x. It should be noted that the imaginary straight line L may extend from any location on the downstream surface 17 and thus may have a tangential component.

The conveying member 30 extends from a starting position 31 to an ending position 32 through the passageway 28 towards the first end 1a (see FIG. 3 ).

The starting position 31 is located at the outer edge 17 ′ of the downstream surface 17 of the upstream deflector device 11 . The end position 32 is located adjacent to or on the inner surface 10 of the casing 3 .

The end position 32 is located closer to the gas inlet 5 than the start position 31 . The end position 32 is also located closer to the gas inlet 5 than the upstream and downstream lateral planes Pa and Pb of the upstream deflector device 11 . Accordingly, the transport member 30 will be inclined from the outer edge 17 ′ towards the gas inlet 5 . Also, the end position 32 will thus be located below the narrowest portion of the passageway 28 .

As can be seen in FIGS. 2 and 4 , the conveying element 30 is thus moved from the downstream surface 17 , more precisely from the outer edge 17 ′ of the downstream surface 17 of the deflector device 11 . is extended As a result, the cleaning liquid collects on the downstream surface 17 and is conveyed through the conveying member 30 towards the inner surface 10 of the casing 3 so that the cleaning liquid flows on the inner surface 10 of the casing 3 . can form.

The scrubber 1 further comprises an edge member 33 extending around the downstream surface 17 , in particular along the outer edge 17 ′ of the upstream deflector device 11 . In a first embodiment, the edge member 33 is annular to surround or at least partially surround the downstream surface 17 of the deflector device 11 .

The edge member 33 extends from the outer edge 17 ′ of the downstream surface 17 and away from the downstream transverse plane Pb and parallel to the longitudinal central axis x towards the gas outlet 6 . to form a wall 34 that becomes

Accordingly, the cleaning liquid collected on the downstream surface 17 of the upstream deflector device 11 can be retained on the downstream surface 17 by the edge member 33 .

The edge member 33 includes an opening 35 extending from the inside to the outside of the edge member 33 and communicating with each transfer member 30 . The opening 35 thus allows the cleaning liquid collected on the downstream surface 17 to escape through the transfer member 30 (see FIG. 3 ).

In the first embodiment, each transfer member 30 is configured as a tray open towards the gas outlet 6 (see FIG. 3 ).

In the first embodiment, the inner shield 20 extends from the inside to the outside of the inner shield 20 and communicates with the respective conveying members 30 to dissipate the cleaning liquid from the deflector device 11 to the gap 21 . It includes an opening 36 to allow feeding (see FIG. 3 ). In the first embodiment, the opening 36 is located at the axial level of the outlet end 23 of the gap 21 , meaning that the opening 36 is formed as a notch in the upstream edge of the inner shield 20 . do. Accordingly, the transfer member 30 can transfer the cleaning liquid from the downstream surface 17 of the upstream deflector device 11 to the gap 21 as can be seen in FIG. 3 .

another embodiment

Fig. 5 shows a second embodiment different from the first embodiment in that the conveying member 30 is composed of a pipe.

Moreover, the conveying member 30 of the second embodiment extends to an end position 32 at an axial distance from the outlet end 23 of the gap 21 . This means that the inner shield 20 can further extend from the end position 32 of the conveying member 30 towards the first end 1a. Moreover, the axial distance between the outlet end 23 of the gap 21 and the upstream transverse plane Pa may be longer than in the first embodiment.

6 shows a third embodiment, which differs from the first embodiment in that the casing 3 has a rectangular, in particular square, cross-sectional shape. Here, the deflector surfaces 16 , 17 may have a roof-like shape, each having two planar surface areas that are inclined to form an angle with each other. The longitudinal cross-sections of FIGS. 1 and 2 can also illustrate these two surface areas. The two inner shields 20 , the gap 21 , the flow prevention element 27 , the pair of the conveying member 30 and the edge member 33 are provided opposite to each other, each straight wall of the casing 3 . extend parallel to each other along the portions. The transverse length T of the inner shield 20 is the sum of the transverse lengths of two opposing inner shields 20 .

According to a variant of the third embodiment, the deflector surfaces 16 , 17 may have a pyramidal shape, and the passage 28 is formed by four orthogonal passages surrounding the respective deflector devices 11 , 12 . Each such passage may include an inner shield 20 , a gap 21 , a flow prevention element 27 , a transfer member 30 and an edge member 33 .

It should be noted that the scrubber 1 may be a one-stage scrubber and thus comprises only one cleaning section 4a , 4b with only one deflector device 11 , 12 . At this time, the single deflector device 11 , 12 , the transfer member 30 and the edge member 33 may be disposed in the inner shield 20 , and the gap width W may be about 4-20 mm.

As indicated by the dashed line in FIG. 2 , due to the typically higher flow of the cleaning liquid in the cleaning section 4b than in the cleaning section 4a, the additional inner shield has a larger gap width W of about 6-16 mm. 20 may be provided external to the downstream deflector device 12 . The transfer element 30 is to be provided at the position of the inner surface 10 of the casing 3 from the downstream surface 17 of the downstream deflector device 12 , in particular in the gap 21 formed by the further inner shield 20 . can

1 , from the downstream surface 17 of the downstream deflector device 12 to the position of the inner surface 10 of the casing 3 , at least one, for example three, conveying members 30 are provided can be The end position 32 of these conveying members 30 may be adjacent to the inner surface 10 of the casing 3 , wherein the velocity of the gas flow is lower than at a greater distance from the inner surface 10 . In FIG. 1 , the inner shield 20 is not provided on the downstream deflector device 12 .

Operation of scrubber (1)

When operating the scrubber 1 , exhaust gas is introduced from the marine engine 2 through a gas inlet 5 . The exhaust gas having a high temperature is guided towards the upstream surface 16 of the upstream deflector device 11 in the upstream cleaning section 4a , where the exhaust gas is forced radially outward towards the passageway 28 . Due to the variable width and especially the reduced flow area in the passageway 28 , the velocity of the gas flow through the passageway 28 is increased and is greatest in the narrowest portion of the passageway 28 .

The cleaning liquid is introduced into the gas flow through the spray nozzle 8 and reacts with the sulfur, soot and particles of the exhaust gas. The cleaning solution will absorb the sulfur, soot and particles to form droplets.

A part of the droplet is forced to move toward the inner surface 10 of the casing 3 . These droplets can then form a liquid flow that flows towards the first liquid outlet 9 by gravity in a direction opposite to the flow direction F of the gas flow. The inner shield 20 locally shields the flow of liquid from the gas flow to prevent the liquid from being forced upward by the gas flow when the liquid flows in the gap 21 outside the inner shield 20 . do. Thereby, discharge|emission of a washing|cleaning liquid becomes easy.

Another part of the droplet flows in the middle of the upstream cleaning section 4a towards the downstream surface 17 of the upstream deflector device 11 , where the velocity of the gas flow is lower than in the more outer region. A droplet impinging on the downstream surface 17 of the upstream deflector device 11 forms a liquid that flows towards the outer edge 17 ′ and the edge member 33 on the downstream surface 17 by gravity. From there, the liquid is conveyed via the conveying element 30 towards the inner surface 10 of the casing 3 , in particular into the gap 21 . From the gap 21 , the liquid from the conveying member 30 is discharged by gravity through the first liquid outlet 9 together with the liquid already flowing along the inner surface 10 of the casing 3 .

The flow area of the gas flow is reduced in the restricting element 13 to increase the velocity of the gas flow as it enters the downstream cleaning section 4b. The exhaust gas from the upstream cleaning section 4a is forced outwardly into the passageway 28 between the downstream deflector device 12 and the inner surface 10 of the casing 3 , where the reduced flow area is the upstream deflector device Further increase the velocity of the gas flow in the same manner as in (11).

A portion of the droplets entrained in the gas flow from the upstream cleaning section 4a and formed in the downstream cleaning section 4b impinge on the inner surface 10 of the downstream cleaning section 4b and the tray 14 and the second liquid for discharge. It forms a liquid that flows downward to the outlet (15). Another portion of these droplets impinges on the downstream surface 17 of the downstream deflector device 12 and forms a liquid that flows downwardly onto the tray 14 and the second liquid outlet 15 on the downstream surface 17 for discharge. do.

The present invention is not limited to the disclosed embodiments and may be modified, modified and combined within the scope of the following claims.

For example, the scrubber 1 may also comprise an additional injection nozzle 8 below the upstream deflector device 11 , for example an injection nozzle for cooling the exhaust gas disposed outside the gas inlet 5 . .

The casing 3, the inner shield 20, the deflector devices 11, 12 and the edge member 30 of the scrubber 1 according to the first embodiment are concentrically arranged and have a uniform circular cross section. According to an alternative embodiment, the casing 3 , the inner shield 20 , the deflector devices 11 , 12 and/or the edge member 33 may be arranged non-concentrically and/or other such as an elliptical, and/or or different cross-sections. Further, the inner shield 20 need not extend entirely around the deflector devices 11 , 12 , but may only partially extend.

The deflector device 11 , 12 of the first embodiment comprises conical upstream and downstream surfaces 16 , 17 . Of course, alternative designs of the deflector devices 11 , 12 are possible. For example, the deflector devices 11 , 12 may instead comprise a planar upstream surface and/or a planar downstream surface.

The flow prevention element 27 of the first embodiment is a block element welded to the casing 3 and extends entirely along the inner shield 20 as a single annular component. Of course, other designs are possible. For example, the flow barrier element 27 may be formed as an integral part of a thin plate or casing 3 and/or may comprise a plurality of sub-elements evenly distributed along the inner shield 20 .

The start position 31 and the end position 32 of the transfer member 30 need not be arranged as described above. For example, the starting position may be disposed on the downstream surface 17 of the upstream deflector device 11 at a distance from the outer edge 17 ′ and/or the transfer member 30 may hold the upstream deflector device 11 . can be extended through In such an embodiment, the downstream surface 17 may be planar. The starting position 31 can even be arranged on the upstream surface 16 of the upstream deflector device 11 . Further, the end position 32 may be arranged in alignment with the start position 31 with respect to the longitudinal central axis x.

Description of details not relevant to the present invention has been omitted and it should be emphasized that the drawings are schematic and not drawn to scale. It should also be noted that some of the drawings are more simplified than others. Accordingly, some components may be shown in one figure but omitted in another figure. Moreover, the expressions "upper", "lower", "vertical", "horizontal", "longitudinal", etc. selected to describe and reflect the scrubber when the scrubber is in its normal operating condition are used herein to refer to different details of the scrubber. It should be emphasized that it is used to distinguish between Accordingly, these expressions are by no means limited.

Claims (15)

A gas scrubber (1), comprising:
a casing (3) extending along a central longitudinal axis (x) and enclosing a cleaning chamber (4), the casing (3) extending into the cleaning chamber (4), a gas inlet (5) for a gas to be cleaned; and a gas outlet (6) for the cleaned gas, extending from the cleaning chamber (4), wherein the casing (3) is such that the gas flow of the gas is directed from the gas inlet (5) to the gas outlet (6) in a flow direction (F) a casing (3) configured to flow through the cleaning chamber (4) into a furnace;
a deflector device 11 provided between the gas inlet 5 and the gas outlet 6 in the cleaning chamber 4 and forming a passageway 28 between the deflector device 11 and the casing 3 , and
A scrubber (1) comprising a spray nozzle (8) disposed between the gas outlet (6) of the casing (3) and the deflector device (11) and configured to spray a cleaning liquid into the cleaning chamber (4) and the gas flow,
The scrubber (1) comprises an inner shield (20) extending between the casing (3) and the deflector device (11) and at least partially surrounding the deflector device (11), the inner shield (20) comprising a casing ( 3) and a gap 21 , said gap 21 having an inlet end 22 to allow a downward flow of cleaning liquid through the gap 21 , past the inner shield 20 , and along the casing 3 . ) and an outlet end 23,
A scrubber, characterized in that both the inlet end (22) and the outlet end (23) of the gap (21) are arranged in the gas flow passage between the gas inlet (5) and the gas outlet (6) of the casing (3) (One). The cleaning liquid according to claim 1, wherein the inlet end (22) of the gap (21) is open toward the gas outlet (6), and the outlet end (23) of the gap (21) is open toward the gas inlet (5), a flow of the scrubber (1) is allowed from the inlet end (22) to the outlet end (23) in a direction opposite to the flow direction (F). 3. A method according to claim 1 or 2, wherein the inner shield (20) extends around the deflector device (11) to provide an annular extension in the gap (21) between the inner shield (20) and the casing (3). , scrubber (1). 3 . The scrubber ( 1 ) according to claim 1 , wherein the casing ( 3 ) and the inner shield ( 20 ) have at least partially identical cross-sections. 3. The longitudinal shield according to claim 1 or 2, wherein the inner shield (20) gradually widens the gap (21) in a direction from the outlet end (23) of the gap (21) towards the inlet end (22). A scrubber (1) comprising an inclined shielding portion (24) inclined inwardly towards a central axis (x). 6. An axial shielding portion (29) according to claim 5, wherein the inner shield (20) extends axially with the casing (3) from the inclined shielding portion (24) towards the outlet end (23) of the gap (21). ), comprising a scrubber (1). 3. A flow prevention element according to claim 1 or 2, wherein the scrubber (1) extends inwardly from the casing (3) into the gap (21) and is arranged to force the cleaning liquid towards the inner shield (20) ( 27), comprising a scrubber (1). 6. The scrubber (1) according to claim 5, wherein the scrubber (1) comprises a flow prevention element (27) extending inwardly from the casing (3) into the gap (21) and arranged to force the cleaning liquid towards the inner shield (20). and this flow prevention element (27) is provided opposite the inclined shielding part (24). According to claim 1 or 2, wherein the deflector device (11),
an upstream surface 16 facing the gas inlet 5 and having an outer edge 16' coincident with the upstream transverse plane Pa, and
A scrubber (1), facing the gas outlet (6) and comprising a downstream surface (17) having an outer edge (17') coinciding with the downstream transverse plane (Pb). The scrubber (1) according to claim 9, wherein the outlet end (23) of the gap (21) is located axially closer to the gas inlet (5) than the upstream transverse plane (Pa). The scrubber (1) according to claim 9, wherein the inlet end (22) of the gap (21) is located axially closer to the gas outlet (6) than the downstream transverse plane (Pb). The scrubber (1) according to claim 9, wherein the injection nozzle (8) is located axially closer to the gas outlet (6) than the inlet end (22) of the gap (21). 3. The scrubber (1) according to claim 1 or 2, wherein the scrubber (1) comprises at least one conveying member (30) extending from the deflector device (11) towards the casing (3), said at least one conveying member (30) ) is configured to guide the cleaning liquid from the deflector device (11) towards the casing (3). 14. The cleaning liquid according to claim 13, wherein the inner shield (20) extends from the inside to the outside of the inner shield (20) and communicates with at least one transfer member (30) from the deflector device (11) to the gap (21). a scrubber (1) comprising at least one opening (36) allowing the supply of 3. The passage (28) according to claim 1 or 2, wherein the passage (28) between the deflector device (11) and the casing (3) has a variable width, and the inner shield (20) covers the narrowest part of the passage (28). A scrubber (1), extending through.

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